refactor: admin user modal, image upload, and new schedule page

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/lib/components/admin/ImageUpload.svelte

@@ -825,7 +825,7 @@
 					{tags.length === 1 ? 'tag' : 'tags'}.
 					{#if tags.length > 0}
 						<div class="mt-3 flex flex-wrap gap-2">
-							{#each tags as tag}
+							{#each tags as tag (tag)}
 								<span
 									class="inline-block rounded-full bg-gray-200 px-2.5 py-1 text-xs text-gray-800"
 								>

frontend/src/lib/components/admin/UserModal.svelte

@@ -287,7 +287,7 @@
 											month: 'long',
 											day: 'numeric'
 										});
-										const today = new Date();
+										const today = new SvelteDate();
 										let age = today.getFullYear() - dob.getFullYear();
 										const m = today.getMonth() - dob.getMonth();
 										if (m < 0 || (m === 0 && today.getDate() < dob.getDate())) age--;